mirror of
https://github.com/claunia/Claunia.Encoding.git
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549 lines
24 KiB
C#
549 lines
24 KiB
C#
//
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// Apple II.cs
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//
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// Author:
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// Natalia Portillo <claunia@claunia.com>
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//
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// Copyright © 2016-2018 Natalia Portillo
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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using System;
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namespace Claunia.Encoding
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{
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/// <summary>
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/// Represents an Radix-50 (PDP-11) character encoding of Unicode characters.
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/// </summary>
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public class Radix50 : Encoding
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{
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const string _bodyname = "radix50";
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const int _codepage = 0;
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const string _encodingname = "Western European (Radix-50)";
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const string _headername = "radix50";
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const string _webname = "";
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const int _windowsCodepage = 0;
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const bool browserDisplay = false;
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const bool browserSave = false;
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const bool mailNewsDisplay = false;
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const bool mailNewsSave = false;
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const bool readOnly = false;
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const bool singleByte = false;
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/// <summary>
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/// The Radix-50 to Unicode character map, when bits are shifted right
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/// </summary>
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static readonly char[] Radix50Table =
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{
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// 0x00
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'\u0020', '\u0041', '\u0042', '\u0043', '\u0044', '\u0045', '\u0046', '\u0047',
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// 0x08
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'\u0048', '\u0049', '\u004A', '\u004B', '\u004C', '\u004D', '\u004E', '\u004F',
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// 0x10
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'\u0050', '\u0051', '\u0052', '\u0053', '\u0054', '\u0055', '\u0056', '\u0057',
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// 0x18
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'\u0058', '\u0059', '\u005A', '\u0024', '\u002E', '\u0025', '\u0030', '\u0031',
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// 0x20
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'\u0032', '\u0033', '\u0034', '\u0035', '\u0036', '\u0037', '\u0038', '\u0039',
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// 0x28 (unused but legal)
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'\u0000', '\u0000', '\u0000', '\u0000', '\u0000', '\u0000', '\u0000', '\u0000',
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// 0x30 (unused but legal)
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'\u0000', '\u0000', '\u0000', '\u0000', '\u0000', '\u0000', '\u0000', '\u0000',
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// 0x38 (unused but legal)
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'\u0000', '\u0000', '\u0000', '\u0000', '\u0000', '\u0000', '\u0000', '\u0000'
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};
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/// <summary>
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/// Gets a value indicating whether the current encoding can be used by browser clients for displaying content.
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/// </summary>
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public override bool IsBrowserDisplay => browserDisplay;
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/// <summary>
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/// Gets a value indicating whether the current encoding can be used by browser clients for saving content.
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/// </summary>
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public override bool IsBrowserSave => browserSave;
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/// <summary>
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/// Gets a value indicating whether the current encoding can be used by mail and news clients for displaying content.
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/// </summary>
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public override bool IsMailNewsDisplay => mailNewsDisplay;
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/// <summary>
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/// Gets a value indicating whether the current encoding can be used by mail and news clients for saving content.
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/// </summary>
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public override bool IsMailNewsSave => mailNewsSave;
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/// <summary>
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/// Gets a value indicating whether the current encoding is read-only.
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/// </summary>
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/// <value>The is single byte.</value>
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public override bool IsReadOnly => readOnly;
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/// <summary>
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/// Gets a value indicating whether the current encoding uses single-byte code points.
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/// </summary>
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public override bool IsSingleByte => singleByte;
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/// <summary>
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/// Gets the code page identifier of the current Encoding.
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/// </summary>
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public override int CodePage => _codepage;
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/// <summary>
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/// Gets a name for the current encoding that can be used with mail agent body tags
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/// </summary>
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public override string BodyName => _bodyname;
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/// <summary>
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/// Gets a name for the current encoding that can be used with mail agent header tags
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/// </summary>
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public override string HeaderName => _headername;
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/// <summary>
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/// Ggets the name registered with the Internet Assigned Numbers Authority (IANA) for the current encoding.
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/// </summary>
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public override string WebName => _webname;
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/// <summary>
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/// Gets the human-readable description of the current encoding.
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/// </summary>
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public override string EncodingName => _encodingname;
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/// <summary>
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/// Gets the Windows operating system code page that most closely corresponds to the current encoding.
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/// </summary>
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public override int WindowsCodePage => _windowsCodepage;
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/// <summary>
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/// Calculates the number of bytes produced by encoding the characters in the specified <see cref="string" />.
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/// </summary>
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/// <returns>The number of bytes produced by encoding the specified characters.</returns>
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/// <param name="s">The <see cref="string" /> containing the set of characters to encode.</param>
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public override int GetByteCount(string s)
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{
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if(s == null) throw new ArgumentNullException(nameof(s));
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return s.Length * 6 % 8 > 0 ? s.Length * 6 / 8 + 1 : s.Length * 6 / 8;
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}
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/// <summary>
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/// Calculates the number of bytes produced by encoding a set of characters from the specified character array.
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/// </summary>
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/// <returns>The number of bytes produced by encoding the specified characters.</returns>
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/// <param name="chars">The character array containing the set of characters to encode.</param>
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/// <param name="index">The index of the first character to encode.</param>
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/// <param name="count">The number of characters to encode.</param>
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public override int GetByteCount(char[] chars, int index, int count)
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{
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if(chars == null) throw new ArgumentNullException(nameof(chars));
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if(index < 0 || index >= chars.Length) throw new ArgumentOutOfRangeException(nameof(index));
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if(count < 0 || index + count > chars.Length) throw new ArgumentOutOfRangeException(nameof(index));
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return count * 6 % 8 > 0 ? count * 6 / 8 + 1 : count * 6 / 8;
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}
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/// <summary>
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/// Calculates the number of bytes produced by encoding all the characters in the specified character array.
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/// </summary>
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/// <returns>The number of bytes produced by encoding all the characters in the specified character array.</returns>
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/// <param name="chars">The character array containing the characters to encode.</param>
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public override int GetByteCount(char[] chars)
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{
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if(chars == null) throw new ArgumentNullException(nameof(chars));
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return chars.Length * 6 % 8 > 0 ? chars.Length * 6 / 8 + 1 : chars.Length * 6 / 8;
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}
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/// <summary>
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/// Encodes a set of characters from the specified <see cref="string" /> into the specified byte array.
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/// </summary>
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/// <returns>The actual number of bytes written into bytes.</returns>
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/// <param name="s">The <see cref="string" /> containing the set of characters to encode.</param>
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/// <param name="charIndex">The index of the first character to encode.</param>
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/// <param name="charCount">The number of characters to encode.</param>
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/// <param name="bytes">The byte array to contain the resulting sequence of bytes.</param>
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/// <param name="byteIndex">The index at which to start writing the resulting sequence of bytes.</param>
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public override int GetBytes(string s, int charIndex, int charCount, byte[] bytes, int byteIndex)
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{
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return GetBytes(s.ToCharArray(), charIndex, charCount, bytes, byteIndex);
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}
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/// <summary>
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/// Encodes all the characters in the specified string into a sequence of bytes.
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/// </summary>
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/// <returns>A byte array containing the results of encoding the specified set of characters.</returns>
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/// <param name="s">The string containing the characters to encode.</param>
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public override byte[] GetBytes(string s)
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{
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if(s == null) throw new ArgumentNullException(nameof(s));
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return GetBytes(s.ToCharArray(), 0, s.Length);
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}
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/// <summary>
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/// Encodes a set of characters from the specified character array into the specified byte array.
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/// </summary>
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/// <returns>The actual number of bytes written into bytes.</returns>
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/// <param name="chars">The character array containing the set of characters to encode.</param>
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/// <param name="charIndex">The index of the first character to encode.</param>
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/// <param name="charCount">The number of characters to encode.</param>
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/// <param name="bytes">The byte array to contain the resulting sequence of bytes.</param>
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/// <param name="byteIndex">The index at which to start writing the resulting sequence of bytes.</param>
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public override int GetBytes(char[] chars, int charIndex, int charCount, byte[] bytes, int byteIndex)
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{
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if(chars == null) throw new ArgumentNullException(nameof(chars));
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if(bytes == null) throw new ArgumentNullException(nameof(bytes));
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if(charIndex < 0) throw new ArgumentOutOfRangeException(nameof(charIndex));
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if(charCount < 0) throw new ArgumentOutOfRangeException(nameof(charCount));
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if(byteIndex < 0) throw new ArgumentOutOfRangeException(nameof(byteIndex));
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if(charIndex >= chars.Length) throw new ArgumentOutOfRangeException(nameof(charIndex));
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if(charCount + charIndex > chars.Length) throw new ArgumentOutOfRangeException(nameof(charCount));
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if(byteIndex >= bytes.Length) throw new ArgumentOutOfRangeException(nameof(byteIndex));
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if(byteIndex + charCount > bytes.Length) throw new ArgumentException(nameof(bytes));
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byte[] temp = GetBytes(chars, charIndex, charCount);
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for(int i = 0; i < temp.Length; i++) bytes[i + byteIndex] = temp[i];
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return charCount;
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}
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/// <summary>
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/// Encodes a set of characters from the specified character array into a sequence of bytes.
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/// </summary>
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/// <returns>A byte array containing the results of encoding the specified set of characters.</returns>
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/// <param name="chars">The character array containing the set of characters to encode.</param>
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/// <param name="index">The index of the first character to encode.</param>
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/// <param name="count">The number of characters to encode.</param>
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public override byte[] GetBytes(char[] chars, int index, int count)
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{
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if(chars == null) throw new ArgumentNullException(nameof(chars));
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if(index < 0) throw new ArgumentOutOfRangeException(nameof(index));
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if(count < 0) throw new ArgumentOutOfRangeException(nameof(count));
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if(count + index > chars.Length) throw new ArgumentOutOfRangeException(nameof(count));
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byte[] bytes = new byte[count * 6 % 8 > 0 ? count * 6 / 8 + 1 : count * 6 / 8];
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int outPos = 0;
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for(int i = 0; i < count; i++)
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{
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byte thisByte = GetByte(chars[index + i]);
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switch(i % 4)
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{
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case 0:
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if(outPos >= bytes.Length) break;
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bytes[outPos] = (byte)(thisByte << 2);
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break;
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case 1:
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if(outPos + 1 >= bytes.Length) break;
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bytes[outPos] += (byte)((thisByte & 0x30) >> 4);
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bytes[outPos + 1] = (byte)((thisByte & 0xF) << 4);
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break;
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case 2:
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if(outPos + 2 >= bytes.Length) break;
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bytes[outPos + 1] += (byte)((thisByte & 0x3C) >> 2);
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bytes[outPos + 2] = (byte)((thisByte & 0x3) << 6);
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break;
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case 3:
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if(outPos + 2 >= bytes.Length) break;
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bytes[outPos + 2] += (byte)(thisByte & 0x3F);
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outPos += 3;
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break;
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}
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}
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return bytes;
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}
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/// <summary>
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/// Encodes all the characters in the specified character array into a sequence of bytes.
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/// </summary>
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/// <returns>A byte array containing the results of encoding the specified set of characters.</returns>
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/// <param name="chars">The character array containing the characters to encode.</param>
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public override byte[] GetBytes(char[] chars)
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{
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return GetBytes(chars, 0, chars.Length);
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}
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/// <summary>
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/// Calculates the number of characters produced by decoding all the bytes in the specified byte array.
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/// </summary>
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/// <returns>The number of characters produced by decoding the specified sequence of bytes.</returns>
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/// <param name="bytes">The byte array containing the sequence of bytes to decode.</param>
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public override int GetCharCount(byte[] bytes)
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{
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return GetCharCount(bytes, 0, bytes.Length);
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}
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/// <summary>
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/// Calculates the number of characters produced by decoding a sequence of bytes from the specified byte array.
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/// </summary>
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/// <returns>The number of characters produced by decoding the specified sequence of bytes.</returns>
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/// <param name="bytes">The byte array containing the sequence of bytes to decode.</param>
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/// <param name="index">The index of the first byte to decode.</param>
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/// <param name="count">The number of bytes to decode.</param>
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public override int GetCharCount(byte[] bytes, int index, int count)
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{
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if(bytes == null) throw new ArgumentNullException(nameof(bytes));
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if(index < 0) throw new ArgumentOutOfRangeException(nameof(index));
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if(count < 0) throw new ArgumentOutOfRangeException(nameof(count));
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if(count + index > bytes.Length) throw new ArgumentOutOfRangeException(nameof(count));
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return count * 8 / 6;
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}
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/// <summary>
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/// Decodes a sequence of bytes from the specified byte array into the specified character array.
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/// </summary>
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/// <returns>The actual number of characters written into chars.</returns>
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/// <param name="bytes">The byte array containing the sequence of bytes to decode.</param>
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/// <param name="byteIndex">The index of the first byte to decode.</param>
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/// <param name="byteCount">The number of bytes to decode.</param>
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/// <param name="chars">The character array to contain the resulting set of characters.</param>
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/// <param name="charIndex">The index at which to start writing the resulting set of characters.</param>
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public override int GetChars(byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex)
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{
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if(bytes == null) throw new ArgumentNullException(nameof(bytes));
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if(chars == null) throw new ArgumentNullException(nameof(chars));
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if(byteIndex < 0) throw new ArgumentOutOfRangeException(nameof(byteIndex));
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if(byteCount < 0) throw new ArgumentOutOfRangeException(nameof(byteCount));
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if(charIndex < 0) throw new ArgumentOutOfRangeException(nameof(charIndex));
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if(byteIndex >= bytes.Length) throw new ArgumentOutOfRangeException(nameof(byteIndex));
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if(byteCount + byteIndex > bytes.Length) throw new ArgumentOutOfRangeException(nameof(byteCount));
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if(charIndex >= chars.Length) throw new ArgumentOutOfRangeException(nameof(charIndex));
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if(charIndex + byteCount > chars.Length) throw new ArgumentException(nameof(chars));
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char[] temp = GetChars(bytes, byteIndex, byteCount);
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for(int i = 0; i < temp.Length; i++) chars[i + charIndex] = temp[i];
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return byteCount;
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}
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/// <summary>
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/// Decodes all the bytes in the specified byte array into a set of characters.
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/// </summary>
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/// <returns>A character array containing the results of decoding the specified sequence of bytes.</returns>
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/// <param name="bytes">The byte array containing the sequence of bytes to decode.</param>
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public override char[] GetChars(byte[] bytes)
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{
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return GetChars(bytes, 0, bytes.Length);
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}
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/// <summary>
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/// Decodes a sequence of bytes from the specified byte array into a set of characters.
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/// </summary>
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/// <returns>The chars.</returns>
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/// <param name="bytes">The byte array containing the sequence of bytes to decode.</param>
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/// <param name="index">The index of the first byte to decode.</param>
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/// <param name="count">The number of bytes to decode.</param>
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public override char[] GetChars(byte[] bytes, int index, int count)
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{
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if(bytes == null) throw new ArgumentNullException(nameof(bytes));
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if(index < 0) throw new ArgumentOutOfRangeException(nameof(index));
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if(count < 0) throw new ArgumentOutOfRangeException(nameof(count));
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if(count + index > bytes.Length) throw new ArgumentOutOfRangeException(nameof(count));
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char[] chars = new char[count * 8 / 6];
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// aaaaaabb bbbbcccc ccdddddd
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int outPos = 0;
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for(int i = 0; i < count; i++)
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{
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byte rd50;
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switch(i % 3)
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{
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case 0:
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rd50 = (byte)((bytes[index + i] & 0xFC) >> 2);
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chars[outPos] = GetChar(rd50);
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outPos++;
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break;
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case 1:
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rd50 = (byte)(((bytes[index + i - 1] & 0x03) << 4) + ((bytes[index + i] & 0xF0) >> 4));
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chars[outPos] = GetChar(rd50);
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outPos++;
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break;
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case 2:
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rd50 =
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(byte)(((bytes[index + i - 1] & 0x0F) << 2) + ((bytes[index + i] & 0xC0) >> 6));
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chars[outPos] = GetChar(rd50);
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chars[outPos + 1] = GetChar((byte)(bytes[index + i] & 0x3F));
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outPos += 2;
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break;
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}
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}
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return chars;
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}
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/// <summary>
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/// Calculates the maximum number of bytes produced by encoding the specified number of characters.
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/// </summary>
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/// <returns>The maximum number of bytes produced by encoding the specified number of characters.</returns>
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/// <param name="charCount">The number of characters to encode.</param>
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public override int GetMaxByteCount(int charCount)
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{
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if(charCount < 0) throw new ArgumentOutOfRangeException(nameof(charCount));
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return charCount * 6 % 8 > 0 ? charCount * 6 / 8 + 1 : charCount * 6 / 8;
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}
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/// <summary>
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/// Calculates the maximum number of characters produced by decoding the specified number of bytes.
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/// </summary>
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/// <returns>The maximum number of characters produced by decoding the specified number of bytes.</returns>
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/// <param name="byteCount">The number of bytes to decode.</param>
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public override int GetMaxCharCount(int byteCount)
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{
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if(byteCount < 0) throw new ArgumentOutOfRangeException(nameof(byteCount));
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return byteCount * 8 / 6;
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}
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/// <summary>
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/// Returns a sequence of bytes that specifies the encoding used.
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/// </summary>
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/// <returns>A byte array of length zero, as a preamble is not required.</returns>
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public override byte[] GetPreamble()
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{
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return new byte[0];
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}
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/// <summary>
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/// Decodes all the bytes in the specified byte array into a string.
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/// </summary>
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/// <returns>A string that contains the results of decoding the specified sequence of bytes.</returns>
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/// <param name="bytes">The byte array containing the sequence of bytes to decode.</param>
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public string GetString(byte[] bytes)
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{
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return GetString(bytes, 0, bytes.Length);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Decodes a sequence of bytes from the specified byte array into a string.
|
|
/// </summary>
|
|
/// <returns>A string that contains the results of decoding the specified sequence of bytes.</returns>
|
|
/// <param name="bytes">The byte array containing the sequence of bytes to decode.</param>
|
|
/// <param name="index">The index of the first byte to decode.</param>
|
|
/// <param name="count">The number of bytes to decode.</param>
|
|
public override string GetString(byte[] bytes, int index, int count)
|
|
{
|
|
return new string(GetChars(bytes, index, count));
|
|
}
|
|
|
|
/// <summary>
|
|
/// Converts a Apple II character to an Unicode character
|
|
/// </summary>
|
|
/// <returns>Unicode character.</returns>
|
|
/// <param name="character">Apple II character.</param>
|
|
static char GetChar(byte character)
|
|
{
|
|
return Radix50Table[character & 0x3F];
|
|
}
|
|
|
|
/// <summary>
|
|
/// Converts a Unicode character to an Apple II character
|
|
/// </summary>
|
|
/// <returns>Apple II character.</returns>
|
|
/// <param name="character">Unicode character.</param>
|
|
static byte GetByte(char character)
|
|
{
|
|
switch(character)
|
|
{
|
|
case '\u0020': return 0x00;
|
|
case '\u0041': return 0x01;
|
|
case '\u0042': return 0x02;
|
|
case '\u0043': return 0x03;
|
|
case '\u0044': return 0x04;
|
|
case '\u0045': return 0x05;
|
|
case '\u0046': return 0x06;
|
|
case '\u0047': return 0x07;
|
|
case '\u0048': return 0x08;
|
|
case '\u0049': return 0x09;
|
|
case '\u004A': return 0x0A;
|
|
case '\u004B': return 0x0B;
|
|
case '\u004C': return 0x0C;
|
|
case '\u004D': return 0x0D;
|
|
case '\u004E': return 0x0E;
|
|
case '\u004F': return 0x0F;
|
|
case '\u0050': return 0x10;
|
|
case '\u0051': return 0x11;
|
|
case '\u0052': return 0x12;
|
|
case '\u0053': return 0x13;
|
|
case '\u0054': return 0x14;
|
|
case '\u0055': return 0x15;
|
|
case '\u0056': return 0x16;
|
|
case '\u0057': return 0x17;
|
|
case '\u0058': return 0x18;
|
|
case '\u0059': return 0x19;
|
|
case '\u005A': return 0x1A;
|
|
case '\u0024': return 0x1B;
|
|
case '\u002E': return 0x1C;
|
|
case '\u0025': return 0x1D;
|
|
case '\u0030': return 0x1E;
|
|
case '\u0031': return 0x1F;
|
|
case '\u0032': return 0x20;
|
|
case '\u0033': return 0x21;
|
|
case '\u0034': return 0x22;
|
|
case '\u0035': return 0x23;
|
|
case '\u0036': return 0x24;
|
|
case '\u0037': return 0x25;
|
|
case '\u0038': return 0x26;
|
|
case '\u0039': return 0x27;
|
|
default:
|
|
// Fallback to '.'
|
|
return 0x1C;
|
|
}
|
|
}
|
|
}
|
|
} |